2) for toddlers: 1/2 tsp is enough, rest depends on the condition. If the stools are too watery, then 1 tsp will also work in favor. Repeat after every half an hour till the problem subsides.

3) for adults: 3-4 tsp is an excellent dose, or you may also increase if the condition is too sensitive.

NOTE: you may also add a pinch of Carom Seeds (Bishop's Weed or Ajwain) to fennel seeds and water. This spice works efficiently in the case of Flatulence (farting or passing gas from the digestive system). In most of the cases, Flatulence comes naturally with diarrhea, especially among the infants.

One More TIP: If you are a parent to an infant, then make it a habit of adding a pinch of both the spices (fennel seeds & carom seeds), whenever you warm milk for your infant or whenever you give the first boil to milk. Its very healthy for your little ones